'
I
Present
NF
Problems
Zero Drive Circuit Advantages
1.
Zero distortion impossible.
I.
Distortion correction
effect
without
amplifying
feedback value.
,,
NF
value decreases due
to
prevention
of
oscillation
2.
As
it
is
based on
the
principle
of
error correction
...
and circuit for phase compensation. Thus such
dis-
which
is
different from NF, it is stable and effec-
tortions
as
switching and cross-over distortions can
tive at high frequencies.
not
be completely removed.
3.
Back electromotive force from
the
speakers
re-
3. Suppresses completely
the
IIM
distortion because
turns
to
the input side through the NF producing
as
the
output
impedance is zero there
is
no inter-
IIM
distortion.
ference with
the
NF
circuit
by
the
speaker's back
electromotive force.
4.
Danger
of
adversely affecting the dynamic charac- 4. Dynamic characteristics are
not
adversely affected.
teristics.
Conventional Amplifier
------------
Output
Impedance
Conventional
"I"
Amp
z
Coi:ventional
"I"
Amp+NF Z/1
+/3
Ideal
"I"
Amp
0
"I''
Amp equipped with
0
Zero Drive Circuit
/J
(NF)
Zero Drive Circuit-equipped Amplifier
Zero Drive Circuit
r----
------
'
I
I
I
I
I
I
I
I
I
/J
(NF}
Distortion
Factor
D
D/l+/3
0
0
-
--,
I
I
I
I
Rl
Rl
Fig. 1-45
------------SERVICE
MANUAL AA·R22/L, AA·R32/L,
AA-R42------------
30
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